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R. F. A. MEYER.

DOOR AND WINDOW LOCK. APPLICATION FILED JAN. H. 1922.

Patented Aug. 22, 1922.

I IN VEN TOR Robarf Ffl Meyer A TTORNE Y ,UNITEIDNSTATESJFPATENT OFFICE.

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To'aZ-Z whom itmag concern: r

Be it known that 1, ROBERT F. A. MEYER, a citizen of the United States,residing at New York, in the county of- New York and State of New York,have invented certain new and usefulImprovements in Door and WindowLocks, of which the following is a specification. H v

Tltiis'invention relates to locks used in 'con junction with d'oo-rsand-windows, the main object being to provide a lock which will permit adoor or window to be partly open and still remain locked so that aperson on the outside of the house cannot open the same farther.

Another object is to provide a device as described having a special typeof key by which the lock can be sprung open after the person hasinserted the key in its proper place, this being accomplished while thedoor stands slightly ajar.

Still another object is to provide a lock especially useful whereconstant ventilation is desirable, without opening the premises topersons not having the proper authority.

These and other objects will become apparent in the descriptionfollowing in which reference characters refer to the like-named parts inthe drawing.

Briefly describing the drawing, Figure 1 represents a fragmentary frontelevation of a door and sash having the device in the locked positionthereon.

Figure 2 is a side elevational section taken on line 2-2 of Figure 1.

Figure 3 is a side elevation of the same but looking at the look fromthe bottom.

Figure 4 is a plan view of the removable key. a

Figure 5 is a cross section taken on line 5-5 of Figure 1 and shows thekey member in position for permitting the door to be opened. The brokenlines in this view repre sent the position of the door, with respect tothe sash, when the key is placed in position.

Describing the drawing in detail, the numeral 10'indicates the sash end11 the door of a standard form of construction used generally on allbuildings. A plate 12 is secured on the interior surface of the door 11by screws 13 and has an angular bracket 14 projecting therefrom andextending over the sash somewhat. A substantially rectangular platemember 15 is permanently secured to the sash 10 by screws 16, and hasears 17 located centrally thereon, forming a pivot Specification ofLetters Patent. Patented Aug, 22, 1922, Application filed January 111922i. Serial No. 528,407.

b racket for'the main locking plate 18 through the medium of pin 19.

An-elongat'ed knob'20 formed on the end of memberl thas a slightlysmaller neck beneath the latter-and is adapted to ride in slot 21of'plate 18. Figures 1 and 2' repr'e sent the doortnd sash members'i ninter-.- lockedwposition. =The door may be opened by'swinging plate 18into theposition illus trated by dotted lines in Figure 1, and simul Itaneously rotating the door. A spring 22 secured to the side of one ofthe ears 17 has ball-shaped stops 22 riveted thereto, the latter urgingthe locking plate 18 into interlocking position when said plate isvertically suspended. Ridges 23 form stop guides for the locking plateand retain the same in contact with part 20 when the door is closed.

The closing and locking of the door is accomplished in the usual manner,the knob 20 meanwhile riding upon wing 25 and forcing the plate 18outward until slot 21 of the latter engages the knob 20. The door isunlocked in this position but since knob 20 is in slot 21 of plate 18,opening the door to any extent will rotate plate 18 in such manner thatthe ends 2 1 of knob 20 will project over the slot and interlock bothmembers with each other. The dotted lines in Figure 2 illustrate theknob 20 entering an interlocking position while plate 18 is beingrotated upwardly, the limit of opening the door being reached, when theend of slot 21 reaches the level of arm 14:.

A means for opening the door from the outside is provided by a key 29having a hole 26 which slips over the pin 27 fixed to the lower endofplate 12. In opening the door after being slightly set ajar, key 29 isplaced on pin 27 and permitted to extend angularly so that the notch 28engages the edge of 18, and the door then closed. In closing, key 29will describe an are about pivot pin 27, member 29 riding in notch 28will be forced out of engagement with knob 20 after which the door canbe opened or closed at will. It is to be noted that, after placing thekey in proper position, it is necessary to close the door to operate thekey 25.

I claim: I

l. A look of the class described comprising a vertical plate secured toa door sash, ears formed on said plate, a slotted locking platepivotally secured between said ears, an angular bracket secured to thedoor within the sash engaging said slotted plate, a spring stop securedto the ears and adapted tourge the slotted plate into engagement with sad bracket when the slotted plate is in Vertical position, means forinterlocking said angular bracket and said slotted plate on openingingplate pivoted between said ears, a spring stop urging the lockingplate into engagement with said knob, said knob adapted to shoulder inthe slot ofthe locking plate when 'partly open and means for disengagingthe ,door bolt from the locking plate by ,clo'singlthe door. v

3. A lock of the class described comprising an angular bracket securedto a door, an

elongated knob on'the end of said bracket, a

slotted locking plate piyotally mounted on the door sash and adapted toreleasably engage the knob end of said bracket, when in the verticalposition, a spring stop urgin thelockingplateinto enga ement with saidbracket, a key member, a pivot stud secured to the sash and. adapted toreceive the key member,'a notch formed on said key engaging the edge ofthe locking. plate and ur ing the latter out of engagement with the oorstud simultaneously with the closin of the. door, and means forinterlocking t e door stud with the lockingplate when in the unlockedposition. v, I

In witness whereof I aflix my si ature.

. ROBERT F. A. M YER.

